Hadrian's Wall, England (© daverhead/Getty Images)

Aerial view of Manhattan, New York City (© Wojtek Zagorski/Getty Images)

Seongsan Ilchulbong, Jeju Island, South Korea (© Quynh Anh Nguyen/Getty Images)

Mount Segla, Senja Island, Troms og Finnmark, Norway (© imageBROKER/Moritz Wolf/Getty Images)

Rethymno, Crete Island, Greece (© Gatsi/Getty Images)

Camels in the desert, United Arab Emirates (© Amazing Aerial Premium/Shutterstock)

Georgian housing, The Circus, Bath, Somerset, England (© Gavin Hellier/Getty Images)

Royal Albert Hall seen from Albert Memorial in Hyde Park, London (© David Bank/Moment/Getty Images)

Bordeaux, France (© Esperanza33/Getty Images)

Wat Chaiwatthanaram temple, Ayutthaya Historical Park, Thailand (© Weerasak Saeku/Getty Images)

North Sea at sunset, Norddorf, Amrum Island, Germany (© Frederick Doerschem/Getty Images)

Temples on Hemakuta Hill, Hampi, Karnataka, India (© Images of india/Alamy Stock Photo)

Przewalski's horses, Hustai National Park, Mongolia (© Ondrej Prosicky/Shutterstock)

Sunset in Glenariff Forest Park, County Antrim, Ireland (© Peter Zelei/Getty Images)

A beer tent at Oktoberfest in Theresienwiese, Munich, Germany (© Peter Kneffel/picture alliance via Getty Images)

Cuban tody, Alejandro de Humboldt National Park, Cuba (© Bruno D'Amicis/Minden Pictures)

Milky Way over Southwest Alentejo and Vicentine Coast Natural Park, Portugal (© Daniel Garrido/Getty Images)

Splügen Pass, Graubunden, Switzerland (© Roberto Moiola/Getty Images)

Roman-inspired aqueduct, Arkadia Park, Poland (© PATSTOCK/Getty Images)

Inside the Nobel Peace Centre, Oslo, Norway (© Ilyas Ayub/Alamy)

Castell y Gwynt, Glyder Fach, Snowdonia National Park, North Wales, UK (© Alan Novelli/Alamy Stock Photo)

Cottonwood trees and red sandstone in Coyote Gulch, Glen Canyon National Recreation Area, Utah (© Stephen Matera/Tandem Stills + Motion)

The Fraser River near Mount Robson, British Columbia, Canada (© phototropic/Getty Images)

Sea otter in Bartlett Cove, Glacier Bay National Park and Preserve, Alaska (© Andrew Peacock/Tandem Stills + Motion)

The Via Krupp footpath on Capri island, Italy (© Mikolaj Niemczewski/Shutterstock)

Container ship near a commercial port in Thailand (© Suriyapong Thongsawang/Getty Images)

Castell Coch, Tongwynlais, Cardiff, Wales, United Kingdom, Europe (© Billy Stock/robertharding/Alamy Stock Photo)

Fall colours in Shenandoah National Park, Virginia (© Michael Ver Sprill/Getty Images)

Lake Bled, Slovenia (© Rasica/Getty Images)